Malicious PDF — malware analysis report

Static analysis result for SHA-256 8007004b85695a61…

MALICIOUS

PDF

78.4 KB Created: 2021-10-05 02:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4d9b85b367e033ab48da6b67fd07b7f3 SHA-1: d869a63d226dc95b41d85cb7b66bc0feb80d4f8a SHA-256: 8007004b85695a61773e103fa5ff2cb43567132a83510fb7eb05b7de2c786d27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://csc-0411.com/userfiles/file/20210920022916_eaoi1d.pdf In PDF document text
    • http://ahcxdq.com/uploads/file/290344406751.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/fapaxuse.pdfIn PDF document text
    • https://stopserv.ru/files/file/42299146298.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/depijowaforafemidegezo.pdfIn PDF document text
    • https://sitarasign.ir/data/file/49871389174.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/12379126762.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/27217382496.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210916032346577.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16147a22f72432---41112267096.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/62680524208.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/62933412545.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/pugefobub.pdfIn PDF document text
    • http://metallpress.info/files/rawipavowatob.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/lebukigunagusu.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/81696308030.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1615882b64ec47---41814713785.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/fojemejagevemu.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/74604689932.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/wofamitowu.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/73780515654.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b708e29fb5---661989402.pdfIn PDF document text
    • http://unseretochter.ch/images/file/vozavotuliberiwefizatupox.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/33468748433.pdfIn PDF document text
    • http://hzqzg.com/d/files/49080997318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=present+continuous+interrogative+and+short+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F8 10856 bytes
SHA-256: 282841e42d610fc3dccb1c4191de43462af093e8f48587684fc34976775a011e
font_01_sfnt_off0000dfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 19800 bytes
SHA-256: 826545ab7c926654bdf201047d6dfbc48a1c1a128738d3425bfb8ec0112ed8d3
font_02_sfnt_off0001139f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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